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Abstract

This mirror reflects soft X-rays over a continuous range of angles of incidence (specular) with high reflectivity. It may be bent to form an optical element at X-ray wavelengths.

Country

United States

Language

English (United States)

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Interference Mirror for Soft X Rays

This mirror reflects soft X-rays over a continuous range of angles of
incidence (specular) with high reflectivity. It may be bent to form an optical
element at X-ray wavelengths.

The mirror can reflect X-rays in a wavelength region of about 10 Angstroms-
100 angstroms. It consists of multiple interference layers and reflects specularly.
The reflectivity peaks for a given wavelength at a specified angle of incidence.

The mirror consists of a single crystal of a transition metal dichalcogenide
which has been "intercalated" with an appropriate chemical compound (organic
or inorganic).

The interference layers are actually the planes of a crystal. Previous attempts
at fabricating multiple interference coatings for the soft X-ray region have been
limited by tolerances for thickness and spacing which are beyond the state of the
art. This is automatically determined in the crystal. Hundreds or thousands of
interference layers are therefore possible.

The mirror can be fabricated to reflect X-rays at any angle of incidence from 0
Degree-90 Degrees. The reflectivity of the mirror is potentially high - as much as
30% for normal incidence. By bending the crystal or fabricating it on a curved
substrate, a mirror of positive or negative focal length is possible. This permits
the construction of geometrical optical devices at soft X-ray wavelengths, such as
microscopes and telescopes.